#pragma once
#include <algorithm>
#include <cstdint>

namespace mtgodot {
// MapOutdoorWater: one shared vertical translation, alternating a random
// 0..-15cm endpoint and zero, linearly interpolated over 1000..3000ms.
struct WaterMotion {
	uint64_t start_ms = 0, duration_ms = 300;
	double begin = 0, end = 0, current = 0;
	bool initialized = false;
	double sample(uint64_t now, uint64_t next_duration, double next_depth_cm) {
		if (!initialized) { start_ms = now; initialized = true; }
		if (now - start_ms > duration_ms) {
			begin = current;
			end = end == 0 ? -std::clamp(next_depth_cm, 0.0, 15.0) * 0.01 : 0;
			start_ms = now;
			duration_ms = std::clamp<uint64_t>(next_duration, 1000, 3000);
		}
		current = begin + (end - begin) * double(now - start_ms) / double(duration_ms);
		return current;
	}
};
}